IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0958542
(2010-12-02)
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| 등록번호 |
US-8685247
(2014-04-01)
|
|
발명자
/ 주소 |
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| 출원인 / 주소 |
- Evoqua Water Technologies LLC
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| 인용정보 |
피인용 횟수 :
0 인용 특허 :
156 |
초록
The present invention relates to systems and processes of wastewater treatment and, in particular, to systems and methods of treating wastewater utilizing biological treatments utilizing two mixed liquor recycle streams for nutrient removal.
대표청구항
▼
1. A process for reducing a concentration of a nutrient from a wastewater comprising: providing a wastewater comprising the nutrient;treating the wastewater by at least one of anoxically treating and aerated anoxically treating in a first anoxic reactor to produce a first anoxically treated mixed li
1. A process for reducing a concentration of a nutrient from a wastewater comprising: providing a wastewater comprising the nutrient;treating the wastewater by at least one of anoxically treating and aerated anoxically treating in a first anoxic reactor to produce a first anoxically treated mixed liquor;aerobically treating the first anoxically treated mixed liquor in an aerobic reactor to produce an aerobically treated mixed liquor;treating a first portion of the aerobically treated mixed liquor in a second anoxic reactor to produce a second anoxically treated mixed liquor having a reduced concentration of the nutrient;introducing a second portion of the aerobically treated mixed liquor to at least one of the wastewater and the first anoxic reactor;introducing a first portion of the second anoxically treated mixed liquor to at least one of the wastewater and the first anoxic reactor; andadjusting a flowrate of the second portion of the aerobically treated mixed liquor. 2. The process of claim 1, further comprising biologically treating a second portion of the second anoxically treated mixed liquor in a biological reactor to produce a biologically treated mixed liquor. 3. The process of claim 2, further comprising separating the biologically treated mixed liquor in a separator to produce an activated sludge and an effluent stream having a reduced concentration of the nutrient. 4. The process of claim 3, further comprising combining at least a portion of the activated sludge with the wastewater. 5. The process of claim 1, wherein the wastewater is anoxically treated in the first anoxic reactor. 6. The process of claim 1, wherein the wastewater is aerated anoxically treated in the first biological reactor. 7. The process of claim 1, wherein adjusting the flowrate is based on at least one characteristic of the wastewater, the first anoxically treated mixed liquor, the aerobically treated mixed liquor, the second anoxically treated mixed liquor, and the biologically treated mixed liquor. 8. The process of claim 1, wherein introducing the first portion of the second anoxically treated mixed liquor to at least one of the wastewater and the first anoxic reactor comprises adjusting a flowrate of the first portion of the second anoxically treated mixed liquor. 9. The process of claim 8, wherein adjusting the flowrate is based on at least one characteristic of the wastewater, the first anoxically treated mixed liquor, the aerobically treated mixed liquor, the second anoxically treated mixed liquor, and the biologically treated mixed liquor. 10. The process of claim 1, wherein the nutrient is selected from the group consisting of nitrogen, phosphorus, and combinations thereof. 11. A wastewater treatment system for reducing a concentration of a nutrient from a wastewater comprising: a source of wastewater comprising the nutrient;one of a first anoxic reactor and an aerated anoxic reactor having an inlet fluidly connected to the source of the wastewater, the one of the first anoxic reactor and the aerated anoxic reactor comprising at least two anoxic zones, wherein a first zone is proximate the inlet and a second zone is proximate an outlet of the one of the first anoxic reactor and the aerated anoxic reactor, and having a lower amount of oxygen supplied to the first zone than the second zone;an aerobic reactor having an inlet fluidly connected to the one of the first anoxic reactor and the aerated anoxic reactor;a second anoxic reactor having an inlet fluidly connected to the aerobic reactor, and an outlet to deliver a mixed liquor stream having a reduced concentration of the nutrient;a first mixed liquor recycle line fluidly connecting an outlet of the aerobic reactor to at least one of the source of wastewater and the first anoxic reactor; anda second mixed liquor recycle line fluidly connecting an outlet of the second anoxic reactor to at least one of the source of wastewater and the first anoxic reactor. 12. The wastewater treatment system of claim 11, wherein the first biological reactor is an anoxic reactor. 13. The wastewater treatment system of claim 11, wherein the first biological reactor is an aerated anoxic reactor. 14. The wastewater treatment system of claim 11, wherein the first mixed liquor recycle line is fluidly connected to a first zone of the one of the first anoxic reactor and the aerated anoxic reactor, and the second mixed liquor recycle line is fluidly connected to a second zone of the one of the first anoxic reactor and the aerated anoxic reactor. 15. The wastewater treatment system of claim 11, further comprising a biological reactor having an inlet fluidly connected to the second anoxic reactor. 16. The wastewater treatment system of claim 15, further comprising a separator having an inlet fluidly connected downstream of the second anoxic reactor. 17. The wastewater treatment system of claim 16, further comprising an activated sludge recycle line fluidly connected to an outlet of the separator and the source of wastewater. 18. The wastewater treatment system of claim 11, further comprising a controller configured to generate a first output signal that energizes a first pump in the first mixed liquor recycle line. 19. The wastewater treatment system of claim 18, wherein the controller is further configured to generate a second output signal that energizes a second pump in the second mixed liquor recycle line. 20. The wastewater treatment system of claim 19, wherein at least one of the first output signal and the second output signal is based on a measured input signal of at least one of a characteristic of the wastewater and the mixed liquor stream having a reduced concentration of the nutrient. 21. The wastewater treatment system of claim 20, wherein the controller is further configured to generate a third output signal that adjusts at least one aeration system in at least one of the one of the first anoxic reactor and the aerated anoxic reactor, the aerobic reactor, the second anoxic reactor, and the biological reactor. 22. The system of claim 11, wherein the nutrient is selected from the group consisting of nitrogen and phosphorus. 23. A method of facilitating wastewater treatment in a wastewater treatment system for reducing a concentration of a nutrient from a wastewater having a source of wastewater, one of a first anoxic reactor and an aerated anoxic reactor, an aerobic reactor, a second anoxic reactor, and a recycle stream fluidly connecting an outlet of the aerobic reactor to at least one of the source of wastewater and the first biological reactor, the method comprising: fluidly connecting an outlet of the second anoxic reactor to at least one of the source of wastewater and the one of the first anoxic reactor and the aerated anoxic reactor; andadjusting a flowrate of the recycle stream fluidly connecting an outlet of the aerobic reactor to at least one of the source of the wastewater and the one of the first anoxic reactor and the aerated anoxic reactor. 24. The method of claim 23, further comprising providing a controller configured to energize a first pump that is disposed to deliver a first biologically treated mixed liquor from the aerobic reactor to at least one of the source wastewater and the one of the first anoxic reactor and an aerated anoxic reactor, and further configured to energize a second pump that is disposed to deliver a second biologically treated mixed liquor from the second anoxic reactor to at least one of the source of wastewater and the one of the first anoxic reactor and an aerated anoxic reactor. 25. The method of claim 24, wherein at least one of the first pump and the second pump is energized based on a characteristic of a stream of the wastewater treatment system. 26. The method of claim 25, wherein the characteristic is selected from the group consisting of nitrogen concentration, phosphorus concentration, temperature, pressure, flowrate, pH, dissolved oxygen concentration, biological oxygen demand, chemical oxygen demand, oxygen uptake ratio, viscosity, and combinations thereof. 27. The method of claim 23, wherein the nutrient is selected from the group consisting of nitrogen, phosphorus, and combinations thereof.
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